Backrest



FIG. 1 is a front perspective view of a backrest;

FIG. 2 is a front elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a left-side elevational view thereof;

FIG. 5 is a right-side elevational view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof; and,

FIG. 8 is a bottom rear perspective view thereof.

The broken lines shown as long dashed lines are representative of seam lines, and form no part of the claimed design.

The broken lines shown as short dashed lines are for the purpose of illustrating unclaimed structure, and form no part of the claimed design. 

CLAIM An ornamental design for a backrest, as shown and described. 